Phase-diffusion pattern in quantum-nondemolition systems
نویسندگان
چکیده
منابع مشابه
Functional integral treatment of some quantum nondemolition systems
In the scheme of a quantum nondemolition (QND) measurement, an observable is measured without perturbing its evolution. In the context of studies of decoherence in quantum computing, we examine the ‘open’ quantum system of a two-level atom, or equivalently, a spin-1/2 system, in interaction with quantum reservoirs of either oscillators or spins, under the QND condition of the Hamiltonian of the...
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T. C. Ralph,* S. D. Bartlett, J. L. O’Brien, G. J. Pryde, and H. M. Wiseman Centre for Quantum Computer Technology, University of Queensland, Brisbane, Queensland 4072, Australia Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia School of Physics, The University of Sydney, Sydney, New South Wales 2006, Australia Centre for Quantum Computer Technology, Center ...
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In this work a family of quantum nondemolition variables for the case of a particle caught in a Paul trap is obtained. Afterwards, in the context of the so called restricted path integral formalism, a continuous measuring process for this family of parameters is considered, and then the corresponding propagators are calculated. In other words, the time evolution of a particle in a Paul trap, wh...
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It is proved that the halt scheme for a universal quantum computer originally proposed by Deutsch works without spoiling the computation. The “conflict” pointed out recently by Myers in the defintion of a universal quantum computer is shown to be only apparent. In the context of quantum nondemolition (QND) measurement, it is also shown that the output observable, an observable representing the ...
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A polarization preserving quantum nondemolition photodetector is proposed based on nonlinearities obtainable through quantum coherence effects. An atomic level scheme is devised such that in the presence of strong linearly polarized drive field a coherent weak probe field acquires a phase proportional to the number of photons in the signal mode immaterial of its polarization state. It is also s...
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ژورنال
عنوان ژورنال: Physical Review A
سال: 2007
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.75.062106